dma.h

   1 /*
   2  * DMA helper functions
   3  *
   4  * Copyright (c) 2009 Red Hat
   5  *
   6  * This work is licensed under the terms of the GNU General Public License
   7  * (GNU GPL), version 2 or later.
   8  */
   9
  10 #ifndef DMA_H
  11 #define DMA_H
  12
  13 #include <stdio.h>
  14 //#include "cpu.h"
  15 #include "hw/hw.h"
  16 #include "block.h"
  17
  18 typedef struct ScatterGatherEntry ScatterGatherEntry;
  19
  20 #if defined(TARGET_PHYS_ADDR_BITS)
  21 struct ScatterGatherEntry {
  22     target_phys_addr_t base;
  23     target_phys_addr_t len;
  24 };
  25
  26 struct QEMUSGList {
  27     ScatterGatherEntry *sg;
  28     int nsg;
  29     int nalloc;
  30     target_phys_addr_t size;
  31 };
  32
  33 void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint);
  34 void qemu_sglist_add(QEMUSGList *qsg, target_phys_addr_t base,
  35                      target_phys_addr_t len);
  36 void qemu_sglist_destroy(QEMUSGList *qsg);
  37 #endif
  38
  39 typedef BlockDriverAIOCB *DMAIOFunc(BlockDriverState *bs, int64_t sector_num,
  40                                  QEMUIOVector *iov, int nb_sectors,
  41                                  BlockDriverCompletionFunc *cb, void *opaque);
  42
  43 BlockDriverAIOCB *dma_bdrv_io(BlockDriverState *bs,
  44                               QEMUSGList *sg, uint64_t sector_num,
  45                               DMAIOFunc *io_func, BlockDriverCompletionFunc *cb,
  46                               void *opaque, bool to_dev);
  47 BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs,
  48                                 QEMUSGList *sg, uint64_t sector,
  49                                 BlockDriverCompletionFunc *cb, void *opaque);
  50 BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
  51                                  QEMUSGList *sg, uint64_t sector,
  52                                  BlockDriverCompletionFunc *cb, void *opaque);
  53 #endif